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You put some good bass in your car, but now your speakers just aren't hanging with your subs. Kicker designed their KS Series speakers to deliver the performance you need to bring that "live music" experience to your ride.

The KS40 4" 2-way speakers use heavy-duty polypropylene cones supported by Santoprene rubber surrounds. Each speaker sports a 1/2" balanced dome tweeter that broadcasts plenty of high-frequency sparkle, so you'll hear all the sonic details that make your tunes exciting.

Product Research

Features

Polypropylene Woofer Cones: The Kicker KS-series speakers
feature durable polypropylene woofer cones for power and control. Polypropylene
is also resistant to the moisture and temperature extremes found in automotive
applications.

Santoprene Surrounds: The woofer surrounds are made of
Santoprene rubber to allow extended cone excursion for additional bass output
and higher SPL. Santoprene is durable and resists moisture for a long life.

Grilles: The KS40s come with a pair of graphite-colored,
plastic, spoke-style speaker grilles.

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At Crutchfield, you'll get detailed, accurate information that's hard to
find elsewhere. That's because we have our own in-house Product Research
team. They verify what’s in the box, check the owner's manual, and record
dimensions, features and specs. We stay on top of new products and technologies
to help people make informed choices.

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Great Speaker

Great speaker to put in any vehicle to help the music sound crisp. The speakers are clear and do not crackle when turned up. Some people say they crack when they turn them up but obviously you shouldn't crank up brand new speakers.

Not quite up to original equipment standard

Written By CraigM, Perryville, MD on Monday, December 17, 2012

I was hoping these would be as good as the Toyota Avalon original equipment 4" component speaker and tweeter but I am very disappointed. The original speakers sounded so much better (until they fell apart from old age!). Now I have very thin sounding speakers that I am already looking to replace. These are a waste of money. I did notice the original speakers had magnets that were twice the size and the cones had twice the depth of the kicker. My advice --- look to pay more for a better product.

Kicker KS40

For the size and type, not a bad sound. I kept the stock reflex box of my '95 325is intact, these are in the package tray of the rear window. These stock boxes are ported, an opening of about 1/2 x 2, I shoved some cotton-based batting material inside of them except around the port wave zone and the low-end response is impressive. I am only pushing about 30 watts as I am using the stock Harmon-Kardon amp. Just don't push this speaker, it's not designed for it.

Pros:For the cost, it's a good upgrade to the factory ones, although, after 17 years, the factory ones were worn out.

Cons:The only caveat, (if you can call it that) is that to put these in the stock boxes, I had to snip off 2 of the 4 mounting tabs. But, with them being serrated, they are designed that way. They were also a tad bit smaller in circumference then factory, so I sealed the gap with silicon. As it turned out, doing that forces the free air out the port - making for lower-end!

Kicker KS40 installed in 1994 Geo Metro

I ordered these speakers 5 days ago (counting the weekend) and they arrived. I could have purchased these speakers elsewhere for a little less, but I'm glad I ordered them from Crutchfield. Not only was the product instruction sheet included, but also a sheet that showed exactly how to install them in my 1994 Geo Metro. Also included for free was the wiring harness I would need to fit each speaker into my car. I just put this little old car back on the road with a new engine because it gets such great gas mileage...I thought I was going to have trouble finding speakers for it because the car is 18 years old.. but Crutchfield had the right speakers and the installation was a breeze... I am a female and anyone could get these speakers installed in a jiffy with the great info from Crutchfield. I received an email to acknowledge my order, another one when it shipped, and another to tell me that it was delivered! I also have earned points with my very first purchase by registering for free! Great service Crutchfield! A great experience doing business with you!